assert "12345"[0] == "1"
assert "12345"[4] == "5"
assert "12345"[-1] == "5"
assert "12345"[:] == "12345"
assert "12345"[2:] == "345"
assert "12345"[:2] == "12"
assert "12345"[1:4] == "234"
assert "12345"[::2] == "135"
